media/cec/cec-intro.rst

1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
3 .. _cec-intro:
8 HDMI connectors provide a single pin for use by the Consumer Electronics
10 HDMI cable to communicate. The protocol for CEC version 1.4 is defined
11 in supplements 1 (CEC) and 2 (HEAC or HDMI Ethernet and Audio Return
12 Channel) of the HDMI 1.4a (:ref:`hdmi`) specification and the
13 extensions added to CEC version 2.0 are defined in chapter 11 of the
14 HDMI 2.0 (:ref:`hdmi2`) specification.
21 CEC, need to be handled by the kernel, others can be handled either by
24 In addition, CEC can be implemented in HDMI receivers, transmitters and
25 in USB devices that have an HDMI input and an HDMI output and that
26 control just the CEC pin.
28 Drivers that support CEC will create a CEC device node (/dev/cecX) to
29 give userspace access to the CEC adapter. The
33 the `v4l-utils <https://git.linuxtv.org/v4l-utils.git/>`_ package. It
34 provides three tools to handle CEC:
36 - cec-ctl: the Swiss army knife of CEC. Allows you to configure, transmit
37   and monitor CEC messages.
39 - cec-compliance: does a CEC compliance test of a remote CEC device to
40   determine how compliant the CEC implementation is.
42 - cec-follower: emulates a CEC follower.